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It reads: "It will become increasingly humid through the end of this week with very warm nights across much of England. South Yorkshire, the Southeast, London, East Midlands and parts of West Midlands, eastern parts of the Southwest, and East Anglia, are likely to see good periods of sunshine, contributing to hot daytime temperatures.

"As a result thresholds are likely to be just met in these areas. There is a very low risk of thunderstorms developing in the south and east.

"Northern areas are likely to be somewhat cloudier, with sunny intervals and occasional showers possible Friday and Saturday, and although it will still be very warm in sunnier intervals in these areas, thresholds are unlikely to be met.

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Storm warning issued for part of South West

A yellow warning of severe weather which covers part of the South West has been issued by the Met Office for Friday.

The warning is currently in place for half of Dorset, covering Weymouth and east across Bournemouth.

It will come into force at 2pm on Friday and run until midnight with slow-moving, thundery downpours expected.

The Met Office says there is a small chance of homes and businesses flooding, as well as delays or cancellations on South West train lines and roads.

The warning reads: "High temperatures may set off some heavy showers and thunderstorms, which in some places could be slow-moving and persistent, bringing a risk of flooding.

"Should they develop, in the heaviest showers some places could see 30mm of rain in an hour, which would likely bring flooding impacts particularly should this fall on an urban area.

"There would also be a smaller chance of impacts from lightning strikes. As is the nature of showers, many places will miss them altogether, and it is not possible to say precisely where they will occur, but the warning area highlights the region at greatest risk."

The forecast currently shows some rain in parts of Devon forecast for Friday - including across North Devon at around 4pm.

The storms should be short-lived with better weather forecast for the weekend in the south.

Devon and Cornwall weekend weather forecast

Early reports indicated the jet stream would weaken and move to the south of the UK allowing more unsettled weather to take charge.

But it now seems that the jet stream will maintain its strength allowing pressure to build across the country.

Fresher air from earlier this week will be banished by warmer and more humid conditions for most as the week progresses with a fine and dry weekend ahead for many locations.

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It will be very warm for large parts of England and Wales, especially in the south, with temperatures reaching the high 20s C for most, and even topping 30C in places.

However, there is a risk of an isolated ​thundery shower and it will feel very humid, especially at night, making it difficult to sleep in the oppressive conditions.

Further north and west it may be more changeable and breezy with outbreaks of rain or showers, but temperatures won’t drop too far.

A spokesperson for The Weather Channel said: “A weak weather front will sink southwards over central and southern areas on Saturday bringing cloud and isolated spits of rain but turning brighter later in day. “Cloudy in the north with light rain over western Scotland and Ireland.

“Very warm over central parts and hot in the south on Sunday with sunny spells. Cloudy in the north with light outbreaks of rain moving into western Scotland and Ireland.

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“Temperatures reaching 30C in the south.”

The weather split between the changeable, less-warm north, and the hot and humid south, will continue into the following week with signs that the settled weather could stay over the UK until well into August.

It will remain bright and warm in the much of the Midlands, southern and eastern England, northeast England and Wales for the foreseeable future but more cloud and breezier elsewhere. Staying warmer-than-average for most into the ​new month with values nudging 30C in places.